New Yamaha Genuine OEM replacement supercharger clutch and drive gear set. Used to replace/update original 59 tooth supercharger clutches originally equipped on 2008-2012 Yamaha 1.8L SHO engines. Note: Original 59 tooth supercharger clutch is no longer offered by Yamaha. This gear set is the correct update/replacement for the original 59 tooth supercharger clutch. New oil pump assembly gasket is required when replacing this clutch. (part# 6S5-13563-00-00)